The faithful were sorely tried there and were shaken completely,
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (there) at that point of fear (were the believers sorely tried) they were tested with a trial, (and shaken with a mighty shock) they were terribly exhausted and violently moved.
Jalāl al-Dīn al-Maḥallī
تفسير : it was there that the believers were [sorely] tried, [there] they were tested, to distinguish the sincere individual from the one otherwise, and were shaken with a mighty shock, because of the severity of the terror.